1231063657 has 2 divisors, whose sum is σ = 1231063658. Its totient is φ = 1231063656.

The previous prime is 1231063609. The next prime is 1231063681. The reversal of 1231063657 is 7563601321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1230325776 + 737881 = 35076^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231063657 - 2²³ = 1222675049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231063157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615531828 + 615531829.

It is an arithmetic number, because the mean of its divisors is an integer number (615531829).

Almost surely, 2^1231063657 is an apocalyptic number.

It is an amenable number.

1231063657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231063657 is an equidigital number, since it uses as much as digits as its factorization.

1231063657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 1231063657 is about 35086.5167407652. The cubic root of 1231063657 is about 1071.7500278634.

Adding to 1231063657 its reverse (7563601321), we get a palindrome (8794664978).

The spelling of 1231063657 in words is "one billion, two hundred thirty-one million, sixty-three thousand, six hundred fifty-seven".